名校
解题方法
1 . 设O为坐标原点,直线
与抛物线C:
交于D,E两点,若OD⊥OE,则C的标准方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
2 . 已知抛物线
,过点
作倾斜角为
的直线l,若l与抛物线交于B,C两点,弦BC的中点P到x轴的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
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3 . 已知抛物线
的过焦点的弦为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e509deba699c04ef28eee118c1f5004b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9582f0b18051d1d0a4424caa69b71c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
您最近一年使用:0次
2018-01-09更新
|
1047次组卷
|
7卷引用:天津市南开区崇化中学2019-2020学年高二上学期期中数学试题
12-13高二上·天津·期末
名校
解题方法
4 . 已知
是抛物线
的焦点,过
且斜率为
的直线交
于
两点.设
,则
的值等于_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee19ddf562596b5b5eadf5cba9ae8041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa05d5575e2b5e7aeb1c1303064f4eef.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571151277416448/1571151283068928/STEM/00e67c22ecc6496491cc0642ca2e7c98.png?resizew=31)
您最近一年使用:0次